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