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