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