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