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