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