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