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