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)(17,18,22,25)(19,28,24,20)(21,26,32,30)(23,27,31,29)(2,5)(3,7)(17,19)(18,20)(21,31)(22,24)(23,32)(25,28)(26,27)(29,30) involution — undirected(10,13)(14,16)(17,20,23,30,22,28,31,26)(18,24,27,32,25,19,29,21)(2,5)(6,8)(9,11,12,15)(10,14,13,16)(18,25)(20,28)(26,30)(27,29)(1,3,4,7)(2,6,5,8)(17,21,23,24,22,32,31,19)(18,26,27,20,25,30,29,28)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.