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