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