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