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