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