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