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