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