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