One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,10)(5,13)(6,8)(7,12)(11,15)(14,16)(19,25)(23,30)(26,28)(31,32)(35,41)(39,42)(43,47)(46,48) involution — undirected(1,3)(2,7)(4,11)(5,10)(6,12)(8,9)(13,14)(15,16)(17,18)(19,23)(20,27)(21,22)(24,29)(25,30)(26,32)(28,31)(33,34,38,36)(35,39,41,42)(37,44,45,40)(43,48,47,46)(2,8)(5,15)(7,9)(10,16)(18,22)(23,30)(24,27)(31,32)(33,35)(34,39)(36,42)(37,43)(38,41)(40,46)(44,48)(45,47) involution — undirected(1,3)(2,9)(4,13)(5,10)(6,12)(7,8)(11,14)(15,16)(17,19)(18,23)(20,28)(21,25)(22,30)(24,32)(26,29)(27,31)(33,36,38,34)(35,42,41,39)(37,44,45,40)(43,48,47,46)(1,4,6,14)(2,10,8,16)(3,11,12,13)(5,9,15,7)(17,20)(18,24)(19,26)(21,29)(22,27)(23,31)(25,28)(30,32)(33,37)(34,40)(35,43)(36,44)(38,45)(39,46)(41,47)(42,48)(1,5,6,15)(2,11,8,13)(3,10,12,16)(4,9,14,7)(17,18)(19,23)(20,24)(21,22)(25,30)(26,31)(27,29)(28,32)(33,35)(34,39)(36,42)(37,43)(38,41)(40,46)(44,48)(45,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.