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