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