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