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