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