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