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