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