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