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