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