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