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