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