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