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