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