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