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