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