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