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