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