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