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