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