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