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