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