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