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