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