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