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