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