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