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