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