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