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