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