One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,10)(8,16)(9,15)(11,13)(12,20)(14,18)(17,19)(21,22)(23,26)(24,27)(25,28)(29,33)(30,34)(31,35)(32,36) involution — undirected(1,2)(3,4)(5,7,10,6)(8,17,19,16)(9,15,11,13)(12,18,14,20)(21,23,25,31)(22,26,28,35)(24,32,33,30)(27,36,29,34)(1,3,4,2)(5,8,10,19)(6,12,7,14)(9,18,11,20)(13,17,15,16)(22,27)(24,33)(26,34)(28,29)(30,32)(35,36)(5,9,10,11)(6,13,7,15)(8,18,19,20)(12,17,14,16)(22,28)(26,35)(27,29)(34,36)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.