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)(11,15)(12,13)(14,16)(17,18)(19,24)(20,26)(21,27)(22,32)(23,25)(28,29)(30,31)(1,3)(2,6)(4,7)(5,8)(11,16)(14,15)(17,19,23,22)(18,24,25,32)(20,28,27,30)(21,31,26,29)(9,11)(10,14)(12,15)(13,16)(18,25)(20,27)(24,32)(28,30) involution — undirected(2,4)(6,7)(11,16)(14,15)(17,20,23,27)(18,26,25,21)(19,28,22,30)(24,29,32,31)(1,4,5,2)(3,7,8,6)(9,11)(10,15)(12,14)(13,16)(17,21,23,26)(18,27,25,20)(19,29,22,31)(24,28,32,30)(1,3)(2,7)(4,6)(5,8)(9,12,13,10)(11,15,16,14)(17,22,23,19)(18,24,25,32)(20,30,27,28)(21,31,26,29)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.