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