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