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