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