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