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