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