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