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