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