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