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