One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10)(11,13)(12,14)(15,16)(17,18)(19,23)(20,25)(21,26)(22,27)(24,28)(29,32)(30,31)(1,3,5,8)(2,6,4,7)(9,10)(11,15)(12,14)(13,16)(17,19,22,21)(18,23,27,26)(20,29,30,28)(24,25,32,31)(9,11)(10,13)(12,16)(14,15)(17,20,22,30)(18,24,27,32)(19,28,21,29)(23,31,26,25)(3,8)(6,7)(11,16)(13,15)(17,20)(18,25)(19,29)(21,28)(22,30)(23,32)(24,26)(27,31) involution — undirected(1,4,5,2)(3,7,8,6)(10,14)(13,15)(17,19,22,21)(18,26,27,23)(20,28,30,29)(24,25,32,31)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.