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