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