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)(17,18,21,25)(19,22,26,31)(20,28,30,24)(23,29,32,27)(1,3)(2,6)(4,7)(5,8)(9,10)(11,15)(12,14)(13,16)(17,19)(18,22)(20,27)(21,26)(23,28)(24,32)(25,31)(29,30) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,19)(18,23)(20,29)(21,26)(22,28)(24,31)(25,32)(27,30) involution — undirected(3,8)(6,7)(11,16)(13,15)(17,19)(18,22)(20,27)(21,26)(23,28)(24,32)(25,31)(29,30) involution — undirected(1,4,5,2)(3,7,8,6)(10,14)(13,15)(19,26)(22,31)(23,32)(27,29)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.