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