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