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