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