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