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