One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(19,25)(23,30)(26,28)(31,32)(35,41)(39,42)(43,47)(46,48) involution — undirected(1,2,5,8)(3,6,9,10)(4,7,12,14)(11,13,15,16)(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)(3,9)(4,12)(6,10)(7,14)(18,22)(19,25)(24,27)(26,28)(33,35)(34,39)(36,42)(37,43)(38,41)(40,46)(44,48)(45,47) involution — undirected(1,3,5,9)(2,6,8,10)(4,11,12,15)(7,13,14,16)(17,19,21,25)(18,23,22,30)(20,28,29,26)(24,32,27,31)(33,36,38,34)(35,42,41,39)(37,44,45,40)(43,48,47,46)(1,2)(3,10)(4,7)(5,8)(6,9)(11,16)(12,14)(13,15)(17,20)(18,24)(19,26)(21,29)(22,27)(23,31)(25,28)(30,32)(33,37,38,45)(34,40,36,44)(35,43,41,47)(39,46,42,48)(1,4,5,12)(2,7,8,14)(3,11,9,15)(6,13,10,16)(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.