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