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