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