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