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