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