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