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