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