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)(15,16)(17,19)(18,20)(21,22,26,29)(23,30,28,25)(24,32,35,27)(31,34,33,36)(7,11)(9,12)(13,15)(14,18)(16,19)(17,20)(23,28)(25,30)(31,33)(34,36) involution — undirected(5,6,8,10)(7,9,11,12)(13,14,17,19)(15,18,20,16)(21,23,26,28)(22,25,29,30)(24,33,35,31)(27,36,32,34)(1,2,3,4)(5,6)(7,9)(8,10)(11,12)(13,16)(14,15)(17,18)(19,20)(21,24,26,35)(22,27,29,32)(23,31,28,33)(25,34,30,36)(5,7,8,11)(6,9,10,12)(13,14)(15,16)(17,19)(18,20)(21,25)(22,28)(23,29)(24,34)(26,30)(27,33)(31,32)(35,36)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.