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